Flashcards in Pump Ops Chpt 5 Deck (69)
Below 32 degrees water is converted to a solid state of matter called
For fire protection purposes ordinary fresh water is considered to weigh _____ or _____ a gal
62.4 lb/ft or 8.3lb/gal
Water may also used to smother fires in combustible liquids whose specific gravity is higher than ____
In this manual pressure is defined as _________.
Force per unit area
Pressure is easily confused with _______. _________ is a simple measure of weight and is expressed in pounds or kilograms
The height required for a 1 square inch column of water to produce 1 psi at its base equals 1 foot divided by ________.
0.434 psi/ft or 2.304 feet
Therefore a column of water 2.304 feet high exerts pressure of _______ psi at its base.
In metrics a cube that is 0.1 m x 0.1 m x 0.1 m x holds _____ liter of water.
The weight of 1 liter of water is ______ kilogram
One cubic meter of water holds 1000 liters of water and weighs _________ kg
The speed at which a fluids travels through a hose or pipe is determined by the pressure upon the fluid as well as The size of the office through which it is flowing. The speed is often called ______
Fluid pressure is perpendicular to any surface on which it acts
Fluid pressure at a point in fluid at rest is the same intensity in all directions. This principle is used in hydrostatic testing
Pressure applied to a confined fluid is transmitted equally in all directions
The pressure of a liquid in an open vessel is proportional to its depth
The pressure of a liquid in an open vessel is proportional to the density of the liquid
The pressure of a liquid at the bottom of a vessel is independent of the shape of the vessel.
This pressure is greatest at low altitudes and least at very high altitudes ________ at sea level is 14.7
Any pressure less than atmospheric pressure is called_______, and absolute zero pressure is called a _____.
Vacuum and perfect vacuum
In the fire service, _____ refers to the height of a water supply above the discharge orifice
To convert head in feet to head pressure, you must divide the number of feet by ______.
The water flow definition of _____ is stored potential energy available to force water through pipes, fittings, hose, and adapters.
Is the portion of the total available pressure not used to overcome friction loss or gravity while forcing water through pipes, fittings, hoses, or adapters.
While water is flowing from a discharge opening the forward velocity pressure is considered
Use a pitot tube and gauge to measure the forward velocity of the _______.
Refers to the center line of the pump or the bottom of a static water supply source above or below ground level.
Is the position of an object in relation to sea level
When a nozzle is above the level of the pump, there is pressure loss. Conversely when a nozzle is below the pump, there is a pressure gain. The pressure losses or gains due to gravity are called ______.
Above sea level atmospheric pressure decreases approximately _______ for every 1000 feet.